i took my stove apart to do my first big cleaning and noticed that my OAK was just sort of sitting at the mouth of the stove. it was touching but the attachment screws weren't doing anything. it's a harman p61a and it looks like the tube goes into the stove mouth and then they put 2 self taping screws into the flexible pipe. But since the stove mouth screw holes are U shaped and not completely round holes - putting 2 self tapping screws into a soft pipe isn't doing anything to secure it. it's back the way it was, but i'm not happy with how it's attached.